THERMOPHYSICAL PROPERTIES OF ROCK MARBLES AS A FUNCTION OF TEMPERATURE

Thermal conductivity and thermal diffusivity of rock marbles have been measured between 290 and 335 K in dry air at atmospheric pressure usi ng the TPS technique. X-ray diffraction has been carried out. Infrared spectroscopic studies identify various polyatomic anions of the type CO32-, NO3-, SO42-, etc. The temperature coefficient of resistivity of the TPS Sensor has also been determined over a wide temperature range . Thermal conductivities and thermal diffusivities do not change with change of heating currents at room temperature. Four of the five sampl es showed a slight increase in thermal conductivity with temperature b ut thermal conductivity of Sohabi White marble showed a decreasing tre nd with rise in temperature.